A tiny M2.2
Since Ohio went all wussy on injection earthquakes, I was expecting the next big action to be in Indiana. They are right on the line.
These are their oil and gas wells. I couldn't find a map of Class II injection wells, but there are over 2000 of these things.
Now, one earthquake does not a party make, but I'm expecting more! They need to find the major fracture zone in the Precambrian, and dump in truckloads!